CN108226293A - A kind of signal pickup assembly for the transmission parallel detection of sandwich structure ultrasonic reflection - Google Patents
A kind of signal pickup assembly for the transmission parallel detection of sandwich structure ultrasonic reflection Download PDFInfo
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- CN108226293A CN108226293A CN201711439946.8A CN201711439946A CN108226293A CN 108226293 A CN108226293 A CN 108226293A CN 201711439946 A CN201711439946 A CN 201711439946A CN 108226293 A CN108226293 A CN 108226293A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/06—Visualisation of the interior, e.g. acoustic microscopy
- G01N29/0654—Imaging
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/26—Scanned objects
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- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The invention belongs to the technical fields such as aviation aerospace manufacture, traffic, building, electronic engineering and non-destructive testing, are related to a kind of signal pickup assembly for the transmission parallel detection of sandwich structure ultrasonic reflection.Present invention employs delay units and door menu member, high pressure ultrasonic pulse excitation original signal is isolated, separation and Extraction has been carried out to the ultrasonic reflection signal from detected pieces received, avoiding high pressure ultrasonic pulse encourages original signal to be loaded directly into the input stage in preprocessor, the first stage amplifier of preprocessor will not be caused to block and damage, and high pressure ultrasonic pulse excitation original signal will not generate interference to small and weak detection signal, and then ultrasonic imaging quality is not interfered with, help to improve the reliability and accuracy of testing result.
Description
Technical field
The invention belongs to the technical fields such as aviation aerospace manufacture, traffic, building, electronic engineering and non-destructive testing, are related to one
Kind transmits the signal pickup assembly of parallel detection for sandwich structure ultrasonic reflection.
Background technology
Ultrasonic automatic scanning image checking is a kind of very important lossless detection method that sandwich structure uses at present,
Signal pickup assembly one kind of use is ultrasonic penetration signal pickup assembly, including transmitting transducer, receives energy converter, ultrasound hair
Unit, transmission signal processing unit, synchronization unit, data acquisition unit are penetrated, wherein synchronization unit generates synchronization pulse control
Ultrasound emission unit processed emits high-voltage pulse pumping signal, and excitation transmitting transducer transmitting ultrasonic signal receives energy converter and receives
Ultrasonic signal, two energy converters are located at the both sides of detected member, need through signal pickup assembly to being received in scanning process respectively
The ultrasonic signal that energy converter receives carries out preposition processing and acquisition and recording, is imaged for ultrasonic penetration method automatically scanning, so as to
Realize the ultrasound detection to detected member, main deficiency is：When detecting defect, it is somebody's turn to do the letter that acquired by signal pickup assembly
It number not can determine that defective bit in detected which face of part, needs to select ultrasonic reflection signal harvester, to detected member again
Secondary scanning, and preposition processing and acquisition and recording are carried out to the detection signal that energy converter in scanning process receives in real time, for
Ultrasonic scanning image just can determine that position of the detection defect in sandwich structure, the ultrasound based on this signal acquisition and record
Signal pickup assembly, during check fee, efficiency it is low, testing cost is high.Another device is ultrasonic reflection signal harvester, packet
It includes transmitting and receives energy converter, ultrasound emission unit, transmission signal processing unit, synchronization unit, data acquisition unit, wherein synchronous
Unit generates synchronization pulse control ultrasound emission unit transmitting high-voltage pulse pumping signal, and excitation transmitting receives energy converter hair
Ultrasonic signal is penetrated, transmitting receives energy converter not only for emitting ultrasonic signal, but also for receiving ultrasonic signal, and energy converter is located at tested
The side of part is surveyed, needs to carry out preposition processing and acquisition and recording to the ultrasonic signal that energy converter in scanning process receives, therefore should
The main deficiency of signal pickup assembly is：1) it needs to be scanned to being detected sandwich structure both sides respectively, could realize to quilt
The detection of sandwich structure is detected, for this reason, it may be necessary to be carried out to the detection signal that the energy converter in twice sweep detection process receives
Preposition processing and acquisition and recording could be used for ultrasonic scanning image detection, and based on this signal acquisition device, detection is similary to take
When, efficiency it is low, testing cost is high；2) in the ultrasonic reflection signal harvester, high pressure ultrasonic pulse excitation original signal and
The reflection signal of the ultrasonic pulse from detected material received is loaded directly into the input stage in preprocessor typically together,
Since high pressure ultrasonic pulse encourages original energy and amplitude very high, it be easy to cause the first stage amplifier resistance of preprocessor
Plug even damages, and high pressure ultrasonic pulse excitation original signal easily generates interference, Jin Erying to small and weak detection signal
Ring the reliability and accuracy of detection image quality and testing result.
Invention content
The purpose of the present invention is being directed to the deficiencies in the prior art, a kind of ultrasonic reflection transmission parallel detection is proposed
Signal pickup assembly, to realize that the ultrasonic reflection of sandwich structure transmits parallel scan image checking.
The present invention technical solution be,
Energy converter is received including transmitting, receives energy converter, ultrasound emission unit, reflection signal processing unit, transmission signal
Processing unit, synchronization unit, data acquisition unit, wherein, the initial pulse signal s that synchronization unit generates0(t) control ultrasound hair
It penetrates unit and generates high voltage stimulating pulses uR2(t), excitation transmitting reception energy converter generates transmitting ultrasonic wave and receives from detected
It is super in Composite Sandwich structure from being detected to receive energy converter reception for ultrasonic reflection signal in Composite Sandwich structure
Signal is insonified, feature is as follows：The initial pulse signal s that synchronization unit generates0(t) it while into delay unit, is delayed single
Member receives the distance between chip of energy converter and detected Composite Sandwich body structure surface or according to starting according to transmitting
Pulse signal s0(t) the time t between the ultrasonic reflection signal F from detected Composite Sandwich body structure surfaces, setting
Delay time Δ t, obtains pulse signal s1(t), s here1(t)=s0(t+ Δ t), Δ t are less than ts；Door menu member receives ultrasound
The high voltage stimulating pulses u that transmitter unit generatesR2(t), transmitting receives ultrasonic reflection signal and the delay unit that energy converter receives
Pulse signal s after delay1(t), delay unit controls door menu member to uR2(t) isolation and to uR1(t) separation and Extraction rises
Begin the time, u is set according to the thickness of detected Composite Sandwich structure or according to the time width between F and BR1(t)
Separation and Extraction deadline, here, F be the ultrasonic reflection signal from detected Composite Sandwich body structure surface, B be from
It is detected the ultrasonic reflection signal of Composite Sandwich structure floor；U after door menu member separation and ExtractionR1(t) it is sent into reflection letter
Number processing unit carries out preposition processing, with sending what transmission signal processing unit carried out preposition processing to be received what energy converter was received
Ultrasonic transmission signal uT(t), the detection to form ultrasonic reflection transmission parallel scan imaging while by data acquisition unit is converted
Signal.
The frequency for the initial pulse signal that the synchronization unit generates selects between 1kHz-4kHz.
The reference time delay Δ t for the delay pulse signal that the delay unit generates generally is selected in 0-50ms.
The bandwidth f of the door menu membermIt is selected according to the frequency that transmitting receives energy converter and receives energy converter, fm>2×max
(f1,f2), max expressions here are maximized, f1、f2Represent that transmitting receives energy converter and receives the centre frequency of energy converter respectively.
The turn-on time t of the door menu memberwIt is typically chosen tn>tw>tFB, herefnFor s0(t) frequency, tFB
Represent ultrasonic reflection signal F from detected Composite Sandwich body structure surface and from detected Composite Sandwich structure
Time width between the ultrasonic reflection signal B of bottom surface.
The data acquisition unit two-way paralleling sampling rate selects between 50MHz-100MHz, has and outer computer
The interface of data exchange is carried out, data transmission bauds is not less than 8MHz.
The present invention has the advantage that and advantageous effect
The present invention proposes a kind of signal pickup assembly for ultrasonic reflection transmission parallel detection, employs delay unit
With door menu member, high pressure ultrasonic pulse excitation original signal is isolated, it is anti-to the ultrasound from detected pieces received
It penetrates signal and has carried out separation and Extraction, avoid high pressure ultrasonic pulse and original signal is encouraged to be loaded directly into the input in preprocessor
Grade will not cause the first stage amplifier of preprocessor to block and damage, and high pressure ultrasonic pulse encourages original signal to weak
Small detection signal will not generate interference, and then not interfere with ultrasonic imaging quality, help to improve the reliability of testing result
With accuracy.The present invention considers the defects of sandwich and is likely located at its two side skin and covering-sandwich splicing interface area,
Need to only preposition processing, acquisition and recording be carried out to the ultrasonic signal during detected Composite Sandwich structure single pass, just
It can be used for ultrasonic reflection method and through transmission technique scanning imagery simultaneously, and then realize and inspection is covered to the detection for being detected sandwich structure
It surveys, when detecting defect, covering or covering-sandwich in sandwich structure where also can determine that detection defect are glued the position in interface area
It puts, based on the supersonic detection method of this ultrasonic signal parallel acquisition device, when check fee is few, detection efficiency is high, testing cost
It significantly reduces.
Description of the drawings
Fig. 1 is the signal pickup assembly schematic diagram of the ultrasonic reflection transmission parallel detection of the present invention.
Specific embodiment
For the signal pickup assembly of ultrasonic reflection transmission parallel detection, including energy converter 1, energy converter 2, ultrasound emission list
Member 3, door menu member 4, reflection signal processing unit 5, delay unit 6, transmission signal processing unit 7, synchronization unit 8, data are adopted
Collect unit 9, as shown in Figure 1, wherein, the initial pulse signal s that synchronization unit 8 generates0(t) control ultrasound emission unit 3 generates
High voltage stimulating pulses uR2(t), excitation transmitting reception energy converter 1 generates transmitting ultrasonic wave and receives from detected composite wood feed collet
Ultrasonic reflection signal in cored structure 10 receives the reception of energy converter 2 and is worn from ultrasound in Composite Sandwich structure 10 is detected
The number of leaking information, feature are as follows：The initial pulse signal s that synchronization unit 8 generates0(t) at the same enter delay unit 6, delay unit 6
Received according to transmitting the distance between chip and detected 10 surface of Composite Sandwich structure of energy converter 1 or according to
Initial pulse signal s0(t) the time t between the ultrasonic reflection signal F from detected 10 surface of Composite Sandwich structures,
Delay time Δ t is set, obtains pulse signal s1(t), s here1(t)=s0(t+ Δ t), Δ t are less than ts；Door menu member 4 receives
The high voltage stimulating pulses u that ultrasound emission unit 3 generatesR2(t), the ultrasonic reflection signal and prolong that transmitting reception energy converter 1 receives
Pulse signal s after the delays of Shi Danyuan 61(t), delay unit 6 controls 4 couples of u of door menu memberR2(t) isolation and to uR1(t) point
From extraction initial time, set according to the thickness of detected Composite Sandwich structure 10 or according to the time width between F and B
Put uR1(t) separation and Extraction deadline, here, F are the ultrasonic reflection from detected 10 surface of Composite Sandwich structure
Signal, B are the ultrasonic reflection signal from detected 10 bottom surface of Composite Sandwich structure；After first 4 separation and Extractions of door menu
uR1(t) it is sent into reflection signal processing unit 5 and carries out preposition processing, with transmission signal processing unit 7 is sent to carry out the quilt of preposition processing
Receive the ultrasonic transmission signal u that energy converter 2 is receivedT(t), it is saturating while by the conversion of data acquisition unit 9 to form ultrasonic reflection
Penetrate the detection signal of parallel scan imaging.
1) synchronization unit 8
Using TTL logic gates and external resistance capacitance, TTL pulse oscillating circuit is formed, generates initial pulse signal s0
(t), this pulse signal coordinates each unit by phase as the clock signal of the signal pickup assembly of ultrasonic reflection transmission parallel detection
The sequential answered works, and the frequency of synchronization unit 8 is selected and controlled by external resistance capacitance.
2) delay unit 6
Delay unit 6 is formed using TTL or CMOS triggers, by delay unit 6 to the initial pulse from synchronization unit 8
Signal s0(t) into obtaining delay pulse signal s after line delay1(t), s1(t)=s0(t+ Δ t), i.e. s1(t) and s0(t) in time domain
The reference time delay that upper difference Δ t, Δ t are generated for delay unit 6, s1(t) pulse width is tw, that is, Δ t and twPass through delay
6 outer connecting resistance of unit and capacitance are selected and are adjusted, and Δ t receives the chip of energy converter 1 and detected composite wood according to transmitting
The distance between 10 surface of feed collet cored structure or tsSetting, tsFor s0(t) it is detected 10 table of Composite Sandwich structure with coming from
Time between the ultrasonic reflection signal F in face is typically chosen Δ t less than ts。
3) door menu member 4
Using the variable connector without decoder of Transistor-Transistor Logic level control is selected to form, conduction and cut-off control terminal is by s1(t)
It controls, the turn-on time of variable connector is by t in door menu member 4wIt determines, twSize according to detected Composite Sandwich structure
10 thickness setting is set according to the time width between F and B, and here, B is from detected Composite Sandwich knot
The ultrasonic reflection signal distance of 10 bottom surface of structure, the bandwidth of door menu member 4 is according to the bandwidth selection of detected ultrasonic reflection signal.
4) signal processing unit 5 and transmission signal processing unit 7 are reflected
Wideband-short pulse analog circuit unit is respectively adopted and forms two Parallel signal processing units, wherein at reflection signal
Unit 5 is managed for handling the ultrasonic reflection signal u from 4 output of door menu memberR1(t), transmission signal processing unit 7 is used to handle
The ultrasonic transmission signal u of the output of energy converter 2 is received from doorT(t), signal processing unit 5 and transmission signal processing unit 7 are reflected
Bandwidth receives energy converter 1, the frequency selection for receiving energy converter 2 according to transmitting, reflects signal processing unit 5 and transmission signal processing
The gain of unit 7 is generally greater than 20dB.
5) data acquisition unit 9
Data acquisition unit 9 includes A/D collecting units and RAM, and wherein A/D selects the A/ with two-way parallel acquisition
D, respectively to carrying out the ultrasonic reflection signal u' of self-reflection signal processing unit 5R1(t) and the ultrasound of transmission signal processing unit 7 is saturating
Penetrate signal u'T(t) parallel acquisition is carried out, is converted to ultrasonic reflection digital signal u "R1(t) and ultrasound transmits digital signal u "T
(t), it and is buffered in RAM, for use in ultrasonic reflection transmission parallel scan imaging.
2. the initial pulse letter generated for the synchronization unit 8 in the signal pickup assembly of ultrasonic reflection transmission parallel detection
Number s0(t) frequency selects between 1kHz-4kHz.
3. the delay pulse letter generated for the delay unit 6 in the signal pickup assembly of ultrasonic reflection transmission parallel detection
Number s1(t) reference time delay Δ t is generally selected in 0.1ms-50ms.
4. for the bandwidth f of the door menu member 4 in the signal pickup assembly of ultrasonic reflection transmission parallel detectionmAccording to transmitting
It receives energy converter 1 and receives the frequency selection of energy converter 2, general fm>2×max(f1,f2), max expressions here are maximized,
f1、f2Represent that transmitting receives energy converter 1 and receives the centre frequency of energy converter 2 respectively.
5. for the turn-on time t of the door menu member 4 in the signal pickup assembly of ultrasonic reflection transmission parallel detectionwGenerally
Select tn>tw>tFB, herefnFor s0(t) frequency, tFBRepresent the time width between F and B.
6. for the 9 two-way parallel sampling of data acquisition unit in the signal pickup assembly of ultrasonic reflection transmission parallel detection
Rate selects between 50MHz-100MHz, has the interface that data exchange is carried out with outer computer, and data transmission bauds is not small
In 8MHz.
7. the course of work of the signal pickup assembly of ultrasonic reflection transmission parallel detection is：
The synchronizing signal s that ultrasound emission unit 3 is exported in synchronization unit 80(t) under control, high voltage stimulating pulses are generated
Signal uR2(t), this high voltage stimulating pulses signal uR2(t) excitation transmitting receives energy converter 1, generates ultrasonic pulse sound wave, this ultrasound
Pulsed sound is traveled to by couplant and reflected ultrasonic wave and transmitted wave is formed in detected Composite Sandwich structure 10,
Middle reflected ultrasonic wave is launched reception energy converter 1 and is received, and forms ultrasonic reflection signal uR1(t), uR2(t) and uR1(t) with difference
Time difference be transmitted to a menu member 4, door menu member 4 is generated in delay unit 6, and and s0(t) there are the doors of Δ t delays
Select signal s1(t) it under controlling, realizes to uR2(t) isolation and to uR1(t) separation and Extraction, the u after separationR1(t) reflection is sent to believe
Number processing unit 5 carries out preposition processing, forms the ultrasonic reflection signal u' of suitable sizeR1(t), simultaneously, ultrasonic transmission wave
It is received energy converter 2 to be received, forms ultrasonic transmission signal uT(t), uT(t) transmission signal processing unit 7 is sent to carry out preposition place
Reason forms the ultrasonic transmission signal u' of suitable sizeT(t), then, u'R1(t) and u'T(t) at the same send data acquisition unit 9 into
Row parallel acquisition forms the detection signal for ultrasonic reflection transmission parallel scan imaging.
Embodiment
Technical solution using the present invention selects the FJ series energy converter of composite material Co., Ltd of Air China to be connect as transmitting
It receives energy converter 1 and receives energy converter 2, the UPower-2 source of ultrasound signal of composite material Co., Ltd of Air China is selected to be sent out as ultrasound
Unit 3 and synchronization unit 8 are penetrated, selects f respectivelynFor 1kHz and 4kHz, delay unit 6 is formed using TTL triggers, is selected
40MHz ultrahigh speeds are formed without decoder variable connector as door menu member 4, using 40MHz bandwidth, the RF circuit module of 22dB
As reflection signal processing unit 5 and transmission signal processing unit 7, using the data collecting system of binary channels 100MHz as number
It is parallel to being transmitted from the ultrasonic reflection of different size and the composite material honeycomb sandwich structure of specification respectively according to collecting unit 9
Detection signal has carried out real-time collection analysis and application, using the result shows that, using the constructed parallel inspection of ultrasonic reflection transmission
Signal pickup assembly is surveyed, can with fast and high quality realize adopting for the transmission parallel detection signal of the ultrasonic reflection in scanning process
Collection.
Claims (6)
1. a kind of signal pickup assembly for ultrasonic reflection transmission parallel detection receives energy converter (1) including transmitting, receives and change
Can device (2), ultrasound emission unit (3), reflection signal processing unit (5), transmission signal processing unit (7), synchronization unit (8),
Data acquisition unit (9), wherein, the initial pulse signal s that synchronization unit (8) generates0(t) control ultrasound emission unit (3) produces
Raw high voltage stimulating pulses uR2(t), excitation transmitting reception energy converter (1) generates transmitting ultrasonic wave and receives from detected composite wood
Ultrasonic reflection signal in feed collet cored structure (10) receives energy converter (2) and receives from detected Composite Sandwich structure
(10) ultrasonic penetration signal in, feature are as follows：The initial pulse signal s that synchronization unit (8) generates0(t) while entrance is delayed
Unit (6), delay unit (6) receive the chip of energy converter (1) and detected Composite Sandwich structure (10) table according to transmitting
The distance between face or according to initial pulse signal s0(t) it is detected Composite Sandwich structure (10) surface with coming from
Time t between ultrasonic reflection signal Fs, delay time Δ t is set, obtains pulse signal s1(t), s here1(t)=s0(t+Δ
T), Δ t is less than ts；Door menu first (4) receives the high voltage stimulating pulses u that ultrasound emission unit (3) generatesR2(t), transmitting is received and is changed
Pulse signal s after ultrasonic reflection signal and delay unit (6) delay that energy device (1) receives1(t), delay unit (6) controls
Door menu first (4) is to uR2(t) isolation and to uR1(t) separation and Extraction initial time, according to detected Composite Sandwich knot
The thickness of structure (10) sets u according to the time width between F and BR1(t) separation and Extraction deadline, here, F is next
Ultrasonic reflection signal from detected Composite Sandwich structure (10) surface, B are from detected Composite Sandwich structure
(10) ultrasonic reflection signal of bottom surface；U after first (4) separation and Extraction of door menuR1(t) be sent into reflection signal processing unit (5) into
The preposition processing of row, with sending what transmission signal processing unit (7) carried out preposition processing to be received ultrasound that energy converter (2) received thoroughly
Penetrate signal uT(t), the detection letter for forming ultrasonic reflection transmission parallel scan imaging while by data acquisition unit (9) is converted
Number.
2. a kind of signal pickup assembly for ultrasonic reflection transmission parallel detection according to claim 1, feature exist
In the frequency for the initial pulse signal that the synchronization unit (8) generates selects between 1kHz-4kHz.
3. a kind of signal pickup assembly for ultrasonic reflection transmission parallel detection according to claim 1, feature exist
In the reference time delay Δ t for the delay pulse signal that the delay unit (6) generates generally is selected in 0.1ms-50ms.
4. a kind of signal pickup assembly for ultrasonic reflection transmission parallel detection according to claim 1, feature exist
In the bandwidth f of the door menu first (4)mIt is selected according to the frequency that transmitting receives energy converter (1) and receives energy converter (2), fm>2
×max(f1,f2), max expressions here are maximized, f1、f2Represent that transmitting receives energy converter (1) and receives energy converter (2) respectively
Centre frequency.
5. a kind of signal pickup assembly for ultrasonic reflection transmission parallel detection according to claim 1, feature exist
In the turn-on time t of the door menu first (4)wIt is typically chosen tn>tw>tFB, herefnFor s0(t) frequency, tFBTable
Show from the ultrasonic reflection signal F for being detected Composite Sandwich structure (10) surface and from detected Composite Sandwich knot
Time width between the ultrasonic reflection signal B of structure (10) bottom surface.
6. a kind of signal pickup assembly for ultrasonic reflection transmission parallel detection according to claim 1, feature exist
In, data acquisition unit (9) the two-way paralleling sampling rate selects between 50MHz-100MHz, have with outer computer into
The interface of row data exchange, data transmission bauds are not less than 8MHz.
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| CN201711439946.8A CN108226293B (en) | 2017-12-26 | 2017-12-26 | Signal acquisition device for ultrasonic reflection and transmission parallel detection of sandwich structure |
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| CN201711439946.8A CN108226293B (en) | 2017-12-26 | 2017-12-26 | Signal acquisition device for ultrasonic reflection and transmission parallel detection of sandwich structure |
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Citations (5)
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| CN1201525A (en) * | 1995-09-18 | 1998-12-09 | 燃烧工程有限公司 | Ultrasonic testing (UT) system signal processing |
| CN1743839A (en) * | 2005-07-15 | 2006-03-08 | 华南理工大学 | Structure defect ultrasonic on-line intelligent identifying system and identifying method |
| CN102297900B (en) * | 2011-06-24 | 2012-12-26 | 中国航空工业集团公司北京航空制造工程研究所 | Multichannel parallel and synchronous acquisition method for ultrasonic pulse signal |
| CN103175893A (en) * | 2013-02-04 | 2013-06-26 | 中国科学院声学研究所 | Defect defecting method based on wide frequency band ultrasonic phase array |
| CN105510444A (en) * | 2015-11-27 | 2016-04-20 | 华南理工大学 | Two-way time reversal damage imaging method based on ultrasonic guided-wave |
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2017
- 2017-12-26 CN CN201711439946.8A patent/CN108226293B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1201525A (en) * | 1995-09-18 | 1998-12-09 | 燃烧工程有限公司 | Ultrasonic testing (UT) system signal processing |
| CN1743839A (en) * | 2005-07-15 | 2006-03-08 | 华南理工大学 | Structure defect ultrasonic on-line intelligent identifying system and identifying method |
| CN102297900B (en) * | 2011-06-24 | 2012-12-26 | 中国航空工业集团公司北京航空制造工程研究所 | Multichannel parallel and synchronous acquisition method for ultrasonic pulse signal |
| CN103175893A (en) * | 2013-02-04 | 2013-06-26 | 中国科学院声学研究所 | Defect defecting method based on wide frequency band ultrasonic phase array |
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